UPDATE: More on Transportation Parts Company thanks to Barney Goodwin of Barney’s Jeep Parts.

Barney wrote, “I hope this helps for your question on Transportation Parts Co.  I put together a little display. Those of us in business who have older inventories have Transportation boxes peeking out at us on the shelves. Shown below are several vintage items from our inventory including a whole tray of gauges.

The name SEAL TEST® is owned today by someone in Europe who produces quality parts supplying to dealers. An example is the shiny box to the right behind the tray.

In our library we have several of their catalogues and can be valuable quick references which are very accurate compared to some today. Inside the catalogue shown in the back of the display and which I’ve put in a ring binder for frequent use, I have copied the introduction which gives a good, brief history of the company in their own words.

The vintage belt buckle is a promo from Transportation.

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Original Post November 27, 2022: This photo was posted to Facebook by Quinton. These private-labeled “Seal Test” Dualmatic lever-style hubs were sold out of the Transportation Parts Co, a jeep parts reseller out of Huntington, New York.

I’m sure someone knows more about Transportation Parts (or even dealt with them in the past).